\begin{table}%t2
  \caption{\label{t2}Calculated and experimental (in parentheses) positions of the strongest band in the 6.2~$\mu$m  region for the PANH ions studied here (in~cm$^{-1}$).}
  %\centering
\par
  \begin{tabular}{lcc}
  \hline\hline
  \noalign{\smallskip}
  PANH& +   &H$^{+}$\\
\hline\\[-3.2mm]
  {Quinoline}   &1563 (1541)&   1618 (1548\tablefootmark{1})\\
  {Isoquinoline}	&1556 (1543)&   1611 (1582)\\
  {Phenanthridine}   &1490\tablefootmark{2}(1508)& 1603 (1582)\\
  {Benzo[h]quinoline} & 1579 (1557) &1590 (1578\tablefootmark{3})\\
  {Acridine}    &1565 (1572)    &1614 (1587)\\
  {1-azapyrene} &	1518 (1549\tablefootmark{4})&  1592 (1597\tablefootmark{5})\\
  {Dibenzo[f,h]quinoline}   &1582(1544) &1599 (...)\\
  \hline
  \end{tabular}
\tablefoot{\tablefoottext{1}{Corresponds to the highest-frequency band seen in the H$^{+}$quinoline  IRMPD spectrum predicted at 1564~cm$^{-1}$.}
\tablefoottext{2}{Value calculated using the BP86 DFT method.}
\tablefoottext{3}{M. T. Vala, personal communication.}
\tablefoottext{4}{Band corresponds to isomer 2-azapyrene, for which the strongest band in the 6.2~$\mu$m region is predicted at 1526~cm$^{-1}$, shifted by 8~cm$^{-1}$ from the band in 1-azapyrene   \citep{mattioda03}.}
\tablefoottext{5}{\citet{vala09a}.}}
  \end{table}